<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style type="text/css">
        @-webkit-keyframes rightan
            {
            
            from
            {
                bottom: 0%;
                opacity: 0;
            }
            to
            {
                bottom: 5%;
                opacity: 1;
            }
            }
            .rightan
            {
            -webkit-animation: rightan 0.8s infinite;
            -webkit-animation-fill-mode: both;
            }
    </style>
</head>
<body>
    <div class="rightan">
        <img src="img/arrow-down.png">
  </div>
</body>
</html>